diff --git a/packages/griffith-mp4/src/mp4/mp4Probe.js b/packages/griffith-mp4/src/mp4/mp4Probe.js
index fd821e48..de6feb17 100644
--- a/packages/griffith-mp4/src/mp4/mp4Probe.js
+++ b/packages/griffith-mp4/src/mp4/mp4Probe.js
@@ -69,6 +69,7 @@ export default class MP4Probe {
       videoSamples[videoSamples.length - 1].start +
         videoSamples[videoSamples.length - 1].bufferStart ===
       stcoBox.samples[stcoBox.samples.length - 1].chunkOffset
+
     return getFragmentPosition(
       videoSamples,
       audioSamples,
diff --git a/packages/griffith-mp4/src/mp4/utils/getSamplesInterval.js b/packages/griffith-mp4/src/mp4/utils/getSamplesInterval.js
index e3c565b6..ecac6a61 100644
--- a/packages/griffith-mp4/src/mp4/utils/getSamplesInterval.js
+++ b/packages/griffith-mp4/src/mp4/utils/getSamplesInterval.js
@@ -11,6 +11,7 @@ export function getVideoSamplesInterval(mp4BoxTree, time = 0) {
   const timeInterval = intervalArray.map(interval =>
     getDuration(sttsBox, interval)
   )
+
   const interval = {
     offsetInterVal: [],
     timeInterVal: [],
@@ -52,8 +53,8 @@ export function getAudioSamplesInterval(mp4BoxTree, videoInterval) {
   let start = 0
   let end = 0
 
-  const {mediaTime} = audioElstBox.entries[0]
-  let startDuration = mediaTime || 0
+  const {mediaTime, segmentDuration} = audioElstBox.entries[0]
+  let startDuration = mediaTime !== -1 ? mediaTime : segmentDuration
   let endDuration = 0
   for (let i = 0; i < sttsBox.samples.length; i++) {
     const {sampleCount, sampleDelta} = sttsBox.samples[i]
diff --git a/packages/griffith-mp4/src/mse/controller.js b/packages/griffith-mp4/src/mse/controller.js
index 9a92a45d..c34577dc 100644
--- a/packages/griffith-mp4/src/mse/controller.js
+++ b/packages/griffith-mp4/src/mse/controller.js
@@ -118,7 +118,6 @@ export default class MSE {
 
   seek = time => {
     FragmentFetch.clear()
-
     const [start, end] = this.mp4Probe.getFragmentPosition(time)
     this.mseUpdating = true